#第三次实习
pro1=read.table("ADdata1.txt",row.names = NULL)#读取文件，不将第一列作为行名
pro2=read.csv("ADdata2.csv")
library(openxlsx)
pro3=read.xlsx("ADdata3.xlsx")
pro4=read.table("ADdata4.txt",row.names = NULL)
h1=merge(pro1,pro2,by=1)#两两按第一列合并，最后再合并
h2=merge(pro3,pro4,by=1)
result=merge(h1,h2,by=1)
